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with <math>h(x,0)=x</math> for each <math>x\in F</math> and |
with <math>h(x,0)=x</math> for each <math>x\in F</math> and |
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::<math>h(F\times [-1,1])\cap \partial M=h(\partial F\times [-1,1])</math>. |
::<math>h(F\times [-1,1])\cap \partial M=h(\partial F\times [-1,1])</math>. |
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In other words, if its [[normal bundle]] is trivial.<ref>{{cite book|last=Hatcher|first=Allen|title=Notes on basic 3-manifold topology|year=2000|page=10 |
In other words, if its [[normal bundle]] is trivial.<ref>{{cite book|last=Hatcher|first=Allen|title=Notes on basic 3-manifold topology|year=2000|page=10}}</ref> |
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This means, for example that a curve in a surface is 2-sided if it has a [[tubular neighborhood]] which is a cartesian product of the curve times an interval. |
This means, for example that a curve in a surface is 2-sided if it has a [[tubular neighborhood]] which is a cartesian product of the curve times an interval. |
Copy and paste: – — ° ′ ″ ≈ ≠ ≤ ≥ ± − × ÷ ← → · § Cite your sources: <ref></ref>
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